mcgahajst



(No Model.)

F. L. MOG'AHAN. EXHAUST MEGHANISM.

No. 462,272. Patented Nov. 3,1891.

WITNESSES.- iaryma. J QK/Wa ATTORNEY.

0., mom'uma wumnnvan n c NITE STATES PATENT OFFICE.

FRED. L. IIICGAIIAN, OF INDIANAPOLIS, INDIANA.

EXHAUST MECHANISM.

@EECIFICATION forming part of Letters Patent No. 462,272, dated November 3, 1891.

Application filed July 20, 1891. Serial No. 400,065. (No model.)

To all whom it may concern:

Be it known that I, FRED. L. hICGAl-IAN, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a new and useful Exhaust Mechanism for SteanrEngins, of which the following is a specification.

My invention relates to an improved mechanism for assisting the exhaust of steam-engines, the same being shown and described as a part of my pending application, Serial No. 378,280, for a patent for apparatus for condensing exhaust-steam.-

The object of my improvel'nent is to form and maintain a partial vacuum in the exhaust pipe of a steanrengine.

The accompanying drawings illustrate my invention.

Figure 1 represents a side elevation of my apparatus attached to a steam-engine. Fig. 2 represents a central longitudinal section of the, vacuum-chamber of the exhaust-pipe and the condense-water trap connected therewith. Fig. 3 represents a central vertical section of the auxiliary vacuum-chamber.

In the drawings, A designates the steamcylinder; B, the exhaust-steam pipe; 0, the vacuum-chamber connected with the exhauststeam pipe; D, a trap for the condense water collecting in the vacuum-chamber, and E an exhaust -fan connected with the vacuumchamber by pipe F.

For the purpose of aiding in the maintenance of a partial vacuum in the vacuumchamber and the exhaust pipe connected therewith in case the movement of the ex haust-fan should be momentarily interrupted by the slipping of its drivingbelt, I provide a cylinder G, which is connected with the vacuunrchamber by pipe II. Cylinder G is provided with anicely-fitting piston I, which is held normally at the upper end of the cylinder by means of a spiral spring J, arranged between a loosely-fitting piston K and the head of a cylinder L, in which the piston K is mounted, said piston being connected by a cord M with the piston I.

The operation of my device is as follows: The engine being started and fan E thereby put in motion, a partial vacuum is formed in chamber 0, and the exhaust-pipe connected therewith. At the same time piston I in the cylinder G yields to the pressure of the atmosphere until said pressure is balanced by spring J. Should the speed of the exhaustfan be momentarily interrupted by the slip ping of its belt or otherwise, the piston is at once drawn upward in the cylinder G by the recoil of spring J, thus maintaining the vacuum in the exhaust-pipe until the fan recovers its normal speed. The exhaust-steam from the engine passing into the vacuum formed by the exhaust-fan and being driven forward by said fan, the piston of the engine is relieved from back-pressure.

I claim as my invention The combination of the exhaust-pipe of a steam engine, the exhaust fan connected therewith, the cylinder G, the piston I, and spring J, all arranged to co-operate substantially as and for the purpose set forth.

FRED. L. MoGAI-IAN. Witnesses:

H. P. Hoop, A. M. U001). 

